Wound debridement: clearing the wound so it can heal

Why dead tissue and callus hold a wound back

Debridement removes dead tissue and slough, a soft film of dead material, to leave a clean wound bed that can heal.⁠^[1] Sharp debridement also breaks up biofilm, a protective film bacteria build, and clears out worn-out cells that no longer help healing.⁠^[6]

When nerve damage lets pressure build on one spot, the skin thickens into callus. The callus raises the load there even further, often with bleeding under the skin and eventually an ulcer.⁠^[2] After researchers trimmed 43 calluses from under the forefoot in 17 people with diabetes, peak pressure at those spots fell by an average of 26%.⁠^[3] In 63 people with diabetes and nerve damage, followed for about 15 months, an ulcer was 11 times more likely to develop under a callus.⁠^[4] If a bent toe or bony spot keeps building callus, see ulcers caused by foot deformity and diabetic foot ulcers.

Callus and dead tissue also hide how deep a wound goes. Guidelines advise debriding them at the first visit, or as soon as possible, so the depth can be judged: in the skin and fat, down to tendon or muscle, or down to bone.⁠^[2] So a wound can look bigger after debridement; the full wound was there all along. When a wound reaches bone, we check for bone infection. Guidelines suggest starting with a probe-to-bone test (feeling for bone with a sterile probe), plain X-rays and a blood test for inflammation,⁠^[5] and we take X-rays at our practice.

Swipe sideways to see the whole drawing.

Debridement in the office

Dr. Efe Ozturk, a Foot and Ankle Surgeon, is board certified in wound care (FAPWH) and in podiatric medicine (DABPM). We debride wounds at all three of our offices during wound care visits, usually every week or two while a wound heals, measuring it each time.

Sharp debridement uses a scalpel, a curette (a small, sharp-edged scoop) and forceps to remove dead tissue from the base and edges of the wound.⁠^[6] The surrounding callus is pared away too, and the process is repeated as needed.⁠^[2] If the wound looks infected, a small piece of tissue from the cleaned, debrided wound identifies the germs more accurately than a surface swab.⁠^[5] We choose antibiotics from those culture results.

Other methods include gels, maggots, water jets, ultrasound, chemicals and lasers. None has good evidence of healing more wounds than sharp debridement, and the International Working Group on the Diabetic Foot (IWGDF) advises against using them in its place.⁠^[1] Enzyme ointments aren’t advised for routine use; they are mainly for places that lack the staff or resources for sharp debridement.⁠^[1]

What it feels like

With diabetic nerve damage there is often little to feel, and a neuropathic ulcer can usually be debrided without a local anesthetic.⁠^[2] The Nerve Institute explains this loss of feeling, called peripheral neuropathy (external site).

Some wounds do hurt. Ulcers caused purely by poor circulation are usually painful,⁠^[2] and venous leg ulcers often are,⁠^[7] so tell us if you feel pain. In six trials of 343 people with venous leg ulcers, a numbing cream (lidocaine–prilocaine) lowered debridement pain by about 21 points on a 100-point scale versus control groups.⁠^[7]

Afterward, the dressing is chosen to soak up drainage while keeping the wound moist; wash your feet, but don’t soak them.⁠^[2] Walking on a numb foot slows an ulcer’s healing,⁠^[2] so we also take pressure off it, often with a knee-high device we fit for you; see total contact casting. Please don’t cut calluses yourself or use corn plasters or liquid callus removers, which can damage the skin and cause infection.⁠^[8] Ozturk Foot & Ankle explains safe corn and callus care (external site).

How often debridement is needed

The IWGDF recommends that the clinician set the frequency by what the wound needs.⁠^[1] In an Australian trial, 122 people with diabetes and a neuropathic ulcer on the sole (without moderate or severe infection or ischemia) were assigned at random to weekly or every-second-week debridement. Judged from photos by experts unaware of each person’s group, 53% and 52% of those assessed had healed by 12 weeks.⁠^[6]

Regular debridement still matters. In records of 312,744 wounds of all kinds from 525 wound centers, wounds debrided more often healed more often and sooner, though records like these can’t prove cause and effect.⁠^[9]

Measuring each visit shows early whether the plan is working. In a trial of 203 people with diabetic foot ulcers seen weekly, ulcers that healed by 12 weeks had shrunk by an average of 82% in the first four weeks. Those that didn’t heal had shrunk by 25%.⁠^[10] For an uninfected wound that hasn’t healed after 4–6 weeks of good care, the IWGDF suggests considering added treatments such as placental membrane grafts or, for wounds with poor circulation, hyperbaric oxygen.⁠^[2] For the wounds that need them, we offer skin substitutes in the office and refer you for hyperbaric oxygen therapy. We turn to surgery when something underneath keeps the wound open.

When debridement belongs in the operating room

If a wound can be debrided safely in the office, the operating room adds cost and may delay care.⁠^[1] But extensive dead tissue, collections of pus and gas-forming infections threaten the limb and need an urgent surgical opinion.⁠^[1] For moderate and severe infections, the IWGDF/IDSA guideline suggests considering surgery within 24–48 hours, along with antibiotics, to remove infected and dead tissue.⁠^[5]

In the operating room, the surgeon can drain pockets of pus, remove dead and infected tissue from deeper layers, including infected bone, and release pressure building inside the foot.⁠^[2] Dr. Ozturk performs these operations and sends tissue, and bone when it’s involved, for culture. See surgery for diabetic foot infection.

Once the wound is clean and has good blood flow, it can be closed. For the wounds that need it, we use negative-pressure wound therapy, which the IWGDF suggests considering for wounds left after foot surgery,⁠^[1] and Dr. Ozturk can close a wound with a skin graft or local flap. If an ulcer under the ball of the foot hasn’t healed with nonsurgical offloading, IWGDF guidance suggests considering an Achilles tendon lengthening, removing a metatarsal head or realigning the bone.⁠^[2] Dr. Ozturk performs these operations for the ulcers that need them; see surgery that takes pressure off ulcers.

Limits and risks

Experts agree that regular debridement helps wounds heal, but high-quality trials showing it, or comparing methods, are limited.⁠^[1] The IWGDF rates the evidence on how often to debride as low certainty, since it comes from a single trial at high risk of bias.⁠^[1]

Blood flow comes first: guidelines advise against debriding an uninfected ulcer with signs of severe ischemia (very poor circulation).⁠^[2] We check circulation with noninvasive testing at our practice and work with vascular specialists to restore it when needed; see circulation tests. Debridement can’t make up for untreated infection, poor blood flow or a wound still taking pressure.⁠^[2]

Taking a tissue sample carries a slight risk of discomfort or bleeding.⁠^[5] Surgical debridement adds the usual risks of an operation and anesthesia, and can leave a larger wound that needs time to close; we go over these trade-offs first.

Questions to ask

• Is the blood flow to my foot good enough for debridement?
• How often will I need it, and how will we know it’s working?
• Can this be done in the office, or do I need the operating room?
• What is causing the callus or pressure, and could surgery fix it?

Told a wound means amputation? A limb salvage second opinion can help you weigh your options.

When to seek care

See us within a day or two for any foot wound that isn’t healing, especially if you have diabetes.